This is Henry from PageFly - Landing Page Builder App
You can try this code by following these steps:
Step 1: Go to Online Store->Theme->Edit code.
Step 2: Search file base.css
Step 3: Paste the below code at bottom of the file → Save
@media (max-width: 767px){
.product__media-item.grid__item.slider__slide,
.product-media-container.media-type-image.media-fit-contain.global-media-settings.gradient.constrain-height {
width: 100% !important;
}
}
Hope that my solution works for you.
Best regards,
Henry | PageFly